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ROCKY MOUNTAIN TWIST

Rocky Mountain Twist is a manufacturer of threaded-shank drill bits and countersinks, specializing in tools designed for use in aerospace, automotive, and general industrial applications where secure shank retention is required. The company’s product line centers on high-speed steel (HSS) and cobalt steel drill bits with threaded shanks, typically featuring a 1/4"-28 thread size that conforms to NAS 965 specifications. These tools are available in a range of diameters—from fractional sizes like 9/64" to wire gauge numbers such as #3, #7, #21, #33, and #36, as well as letter sizes like Letter F—and in overall lengths from 9/16" to 2-1/8". The black oxide finish on these bits provides corrosion resistance and reduces friction during drilling. Rocky Mountain Twist bits are built to meet Type B or Type D requirements under NAS 965, indicating their suitability for use in portable drilling operations where the threaded shank locks into a mating collet or adapter. 3G Electric stocks over 369 SKUs of Rocky Mountain Twist threaded-shank drill bits and countersinks, covering both HSS and cobalt variants. This inventory supports maintenance, repair, and production environments where operators need to quickly change bits without removing the tool from the holder. The threaded shank design eliminates the need for a chuck, allowing direct mounting into threaded spindles or quick-change systems common on assembly lines and in field repair kits. For procurement specialists and plant engineers, the availability of multiple diameters and lengths in both HSS and cobalt means they can select the appropriate material for the workpiece—HSS for general-purpose drilling in steel and aluminum, cobalt for higher heat resistance when working with harder alloys or stainless steel. 3G Electric provides global shipping for these tools, ensuring that facilities worldwide can access these specialized drill bits without relying on local distributors. The catalog includes detailed specifications such as thread size, overall length, diameter, and NAS compliance, enabling engineers to match the bit to their specific drilling requirements. Whether for aircraft frame assembly, heavy equipment maintenance, or precision machining, Rocky Mountain Twist threaded-shank drill bits offer a standardized interface that reduces downtime and improves drilling accuracy.

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About ROCKY MOUNTAIN TWIST

Rocky Mountain Twist is a manufacturer of threaded-shank drill bits and countersinks, specializing in tools designed for use in aerospace, automotive, and general industrial applications where secure shank retention is required. The company’s product line centers on high-speed steel (HSS) and cobalt steel drill bits with threaded shanks, typically featuring a 1/4"-28 thread size that conforms to NAS 965 specifications. These tools are available in a range of diameters—from fractional sizes like 9/64" to wire gauge numbers such as #3, #7, #21, #33, and #36, as well as letter sizes like Letter F—and in overall lengths from 9/16" to 2-1/8". The black oxide finish on these bits provides corrosion resistance and reduces friction during drilling. Rocky Mountain Twist bits are built to meet Type B or Type D requirements under NAS 965, indicating their suitability for use in portable drilling operations where the threaded shank locks into a mating collet or adapter. 3G Electric stocks over 369 SKUs of Rocky Mountain Twist threaded-shank drill bits and countersinks, covering both HSS and cobalt variants. This inventory supports maintenance, repair, and production environments where operators need to quickly change bits without removing the tool from the holder. The threaded shank design eliminates the need for a chuck, allowing direct mounting into threaded spindles or quick-change systems common on assembly lines and in field repair kits. For procurement specialists and plant engineers, the availability of multiple diameters and lengths in both HSS and cobalt means they can select the appropriate material for the workpiece—HSS for general-purpose drilling in steel and aluminum, cobalt for higher heat resistance when working with harder alloys or stainless steel. 3G Electric provides global shipping for these tools, ensuring that facilities worldwide can access these specialized drill bits without relying on local distributors. The catalog includes detailed specifications such as thread size, overall length, diameter, and NAS compliance, enabling engineers to match the bit to their specific drilling requirements. Whether for aircraft frame assembly, heavy equipment maintenance, or precision machining, Rocky Mountain Twist threaded-shank drill bits offer a standardized interface that reduces downtime and improves drilling accuracy.

Common Applications

  • Aerospace assembly — Rocky Mountain Twist NAS 965 Type D cobalt drill bits for drilling titanium airframe components
  • Automotive production line — Rocky Mountain Twist HSS threaded-shank drill bits for quick-change drilling in aluminum engine blocks
  • Heavy equipment maintenance — Rocky Mountain Twist cobalt drill bits for drilling hardened steel in field repair kits
  • Precision machining — Rocky Mountain Twist HSS drill bits in wire gauge sizes for jig and fixture drilling
  • Portable drilling operations — Rocky Mountain Twist threaded-shank drill bits for use with magnetic drill stands in structural steel fabrication

Frequently asked questions

Common questions about ROCKY MOUNTAIN TWIST from 3G Electric.

What thread size do Rocky Mountain Twist drill bits use?

Rocky Mountain Twist threaded-shank drill bits use a 1/4"-28 thread size. This is a standard UNF (Unified Fine) thread that allows the bit to be screwed directly into a threaded spindle, collet, or adapter. The 1/4"-28 thread is common in aerospace and industrial applications where quick tool changes are needed without a chuck.

What NAS specification do Rocky Mountain Twist drill bits meet?

Rocky Mountain Twist drill bits conform to NAS 965, which covers threaded shank drills for portable and fixed drilling operations. The bits are available in Type B (standard length) and Type D (short length) configurations. NAS 965 ensures dimensional consistency and thread fit, making these bits interchangeable with other NAS 965-compliant tooling.

What materials are Rocky Mountain Twist drill bits made from?

Rocky Mountain Twist offers drill bits in high-speed steel (HSS) and cobalt steel. HSS bits are suitable for drilling in mild steel, aluminum, and plastics. Cobalt bits contain a higher percentage of cobalt (typically 5-8%), providing increased hardness and heat resistance for drilling in stainless steel, titanium, and other tough alloys. Both types have a black oxide finish for wear resistance.

What diameters and lengths are available for Rocky Mountain Twist threaded-shank drill bits?

Rocky Mountain Twist threaded-shank drill bits are available in fractional sizes (e.g., 9/64"), wire gauge numbers (e.g., #3, #7, #21, #33, #36), and letter sizes (e.g., Letter F). Overall lengths range from 9/16" to 2-1/8". The 3G Electric catalog includes over 369 SKUs covering these variations, allowing selection based on hole depth and clearance requirements.

Can Rocky Mountain Twist drill bits be used with a standard drill chuck?

No, Rocky Mountain Twist drill bits are designed with a threaded shank (1/4"-28) and are not intended for use with a standard three-jaw chuck. They require a mating threaded spindle, collet, or adapter that accepts the 1/4"-28 thread. This design is common in aerospace assembly tools and quick-change systems where the bit is screwed directly into the holder.

What is the difference between Type B and Type D in Rocky Mountain Twist drill bits?

Under NAS 965, Type B refers to standard-length threaded-shank drill bits, while Type D refers to short-length bits. Type D bits have a shorter overall length for use in confined spaces or where reduced overhang is needed. Both types share the same 1/4"-28 thread and diameter range, but the overall length differs. Check the product specifications for the specific type.